Sorting through this... early on page 10, Freyja was searching the surface with the Hierophant. Then she suddenly went inside, and abruptly joined the others. Later on the page, a post for Jax seems to read that she's still outside with Bronzi, and then a post from Wes also seems to be based on the idea that Freyja is still outside with Bronzi, so it seems that neither noticed Freyja had moved inside. Bronzi's posts still indicated he was outside.
No one had acknowledged Freyja had moved inside even by the time of the next post for her, on the next page, after the Rix appeared. The post for Junko two thirds of the way down page 11 was the first time anyone else acknowledged Freyja was inside, and Bronzi was still outside at the end of that page. Bronzi remained outside on page 12 and Freyja's presence inside still wasn't acknowledged by anyone other than Junko until Natsumi's post where she yelled at Freyja for opening fire.
Bronzi was still outside after hearing Natsumi's yelling. After she passed out, he 'stomped over'. It's not clear how he managed to get inside, unless he jumped through the hull (takes 'stomping over there' to a whole new level), though it wasn't clear for Freyja either (she went through the airlock at some point?) No one objected to either, though, so apparently it was possible... I'd assume that the Hierophant found an open cargo bay and ran in through there. Natsumi had provided vague data of that sort earlier.